It's almost a cliche in wuxia stories: the so-called "orthodox" sects, supposedly the virtuous defenders of justice, are actually evil, ambitious groups who resort to bullying and numbers to attack the supposedly evil "demonic" sect, which is actually much less evil (though hardly saints) than the orthodox sects and much less hypocritical. We see this in Jin Yong's HSDS and SPW, and Gu Long's FULL MOON, CURVED SABRE.
It's such a cliche that you almost expect it. Is there any wulin story, however, where by and large the orthodox sects really are true blue heroes and men of virtue? It would almost be a nice exception to the general rule.